Throttle-valve.



No Model.)

Patented Jan. 23, I900.

K. RUSHTON.

THROTTLE VALVE.

(Application filed Dee. l, 1897.

n: n'on ms PEYERS [magi/i 21 a s/ziazz o. morn-Luna, WASHINGTON, n cy'rns PATEN rrIcE.

KENNETH RUSHTON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO BURNHAM,TVILLIAMS dz 00., OF SAME PLACE.

TH BOTTLE-VALVE.

,SPECIFICATION forming part of Letters Patent No. 642, 07, da d Jan ary2 0- Application filed December 1, 1897. Serial No. 660,890. (No model.)

1'0 alt 10/1/0721, it may concern.-

Be it known that I, KENNETH RUsH'roN, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Throttle-Valves, of which the following is aspecification.

The object of my invention is to so construct a double-seatedthrottle-valve that it will take steam only from the top of the dome orother part of the boiler in which it is situated, thus preventing theadmission of wet steam to the steam-supply pipe.

My invention is especially adapted to locomotive-boilers, and the valveis situated in the dome of the boiler; but it will be understood that itcan be used in other types of boilers without departing from myinvention.

In the accompanying drawings, Figure 1 is a sectional view of sufficientof a locomotiveboiler to illustrate my invention, the valve being open.Fig. 2 is a view' showing the valve closed.

A is the boiler.

A is the dome.

B is the steam-supply pipe, leading from the boiler to the cylinders ofthe locomotive in the present instance.

D is the valve-casing, secured to the steamsupply pipe 13 in anysuitable manner.

E is the valve, having two flanges e 6, adapted to seats at cl at thetop and bottom of the valve-casing, respectively. The valve has acentral passage 6 open at the top and communicating with side passages 6between the lower flange e and a disk 6 The disk e is adapted to thelower flanged portion d of the casing and is attached to the valve-rodE. When the valve is raised, as shown in Fig. 1, steam will be admittedto the valvecasing from the upper portion of the dome only, the steampassing between the upper flange c and its seat and down through thecentral passage 6 in the valve and out through the side passages 2between the lower flange e and its seat, thus insuring the admission ofdry steam to the supply-pipe B.- The valverod E is connected to a leverE pivoted at f to the pipe B, and is connected to an operating-rod Eextending to the cab of the 1000- motive. When the valve is closed, asillustrated in Fig. 2, both flanges are seated on the casing and thedisk is at its lowest point in the flanged portion d of the casing.

I claim as my invention- The combination of a valve-casing having twoseats, a valve having upper and lower flanges adapted to said seats,said valve having a central opening, and a disk adapted to thevalve-casing formed integral with the valve and arranged below the lowerflange of the same, such location of the disk providing a passagebetween the same and the lower flange, with which the opening in thevalve communicates so that steam will be admitted to the valve-casingonly from above, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

KENNETH RUSHTON.

W'itnesses:

WILL. A. BARR, Jos. H. KLEIN.

